NodeBackgroundPaint Event Fires Very Frequently

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I have a form with 3 TreeviewAdv controls, and I noticed high CPU usage with this form. Upon analysis, it was found that NodeBackgroundPaint is being fired very frequently, even if user is not doing anything (idle state). Can somebody tell me when is this event fired and how to resolve this?

I am using this event to paint the background of the nodes as suggested in the help/documentation.